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  • 1
    Electronic Resource
    Electronic Resource
    Nonlocal diffusivity: Impact on transient transport studies (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 4589-4595 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonlocal effects are observed in a number of transient transport studies in tokamaks and stellarators. In this paper some consequences of nonlocality are discussed on the basis of a heuristic model for the electron heat diffusivity (χe). The main consequence is the presence of an additional ("missing'') heating power term (p˜χ) in the heat transport equation. Suitable combinations of p˜χ and modulated power profiles should give rise to detectable effects in modulated heating experiments such as those planned on the Frascati Tokamak Upgrade (FTU) [R. Andreani et al., in Fusion Technology, Proceedings of the 16th Symposium, London, 1990, edited by B. E. Keen, M. Huguet, and R. Hemsworth (Elsevier Science, Amsterdam, 1991), Vol. 1, p. 218]. Failure to properly include p˜χ effects (if present) can lead to an overestimate of χe from heat wave propagation analysis. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871444
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  • 2
    Electronic Resource
    Electronic Resource
    Factor(s) from nonmacrophage bone marrow stromal cells inhibit Lewis lung carcinoma and B16 melanoma growth in mice (1999)
    Springer
    Cellular and molecular life sciences 55 (1999), S. 663-667 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Bone marrow stroma; negative growth regulator; antiproliferative effect; tumor growth; lung metastases.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Bone marrow stroma produces positive and negative growth regulators which constitute the hematopoietic microenvironment. As many tumors metastasize to the bones, these regulators may also influence tumor growth. Hematopoietic cytokines may indeed exert both positive and negative effect on tumor growth. We report that, when mixed with tumor cells, adherent bone marrow cells inhibit primary tumor growth and metastases formation in mice transplanted with Lewis lung carcinoma or B16 melanoma. Peritoneal macrophages or lymph node cells did not exert any influence. The tumor inhibition was apparently due to soluble factor(s) released by marrow stromal cells. In cocultures with B16 melanoma cells, adherent bone marrow cells exerted a significant antiproliferative effect which was increased by previous culture of the bone marrow cells with granulocyte-macrophage colony-stimulating factor but not with macrophage colony-stimulating factor. Neither neutralizing antibodies against tumor necrosis factor-α, transforming growth factor-β or interferon α/β nor addition of Escherichia coli lipopolysaccharide to generate inflammatory cytokines could affect the antiproliferative effect of bone marrow stromal cells. The bone marrow stroma factor(s) which inhibit tumor growth might, therefore, be a novel growth regulator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050322
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  • 3
    Electronic Resource
    Electronic Resource
    Tg/dta, Xrd and NH3-TPD Characterization of Layered VOPO4·2H2O and its Fe3+-Substituted Compound (1998)
    Springer
    Journal of thermal analysis and calorimetry 52 (1998), S. 615-630 
    Details
    ISSN: 1572-8943
    Keywords: Fe3+-vanadyl phosphate ; NH3-TPD ; surface acidity ; TG/DTA ; vanadyl phosphate ; XRD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Iron(III)-substituted vanadyl phosphate, [Fe(H2O)]0.20VO0.80PO4·2.25H2O (FeVOP), has been prepared and characterized by XRD and TG/DTA analyses. The new compound is isomorphous with layered tetragonal VOPO4·2H2O (VOP), but it possesses a lower interlayer distance. Information on the reactivity and surface acidity of both VOP and FeVOP has been obtained by NH3-TPD experiments. The hydrated materials adsorb high amounts of NH3 (up to 2 mmol g-1). Different ammonia-containing phases are formed, characterized by lower interlayer distances in comparison with the NH3-free parent compounds. NH3 is intercalated between the layers without displacement of water. The materials dehydrated by heat treatment at 450°C retain the layered structure but adsorb NH3 only on the external surface. A wide variety of acid sites, from weak to strong, was observed. A mechanism is proposed for the NH3- acid sites interaction. SEM micrographs of VOP and FeVOP are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010136126445
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  • 4
    Electronic Resource
    Electronic Resource
    Active tectonics and seismicity in the area of the 1997 earthquake sequence in central Italy: A short review (1999)
    Springer
    Journal of seismology 3 (1999), S. 167-175 
    Details
    ISSN: 1573-157X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A first tentative comparison between the structural framework related to the active tectonics and the long-term seismicity of the Umbria–Marche Apennines (affected by the 1997 seismic sequence) has provided some insight for discussing the seismotectonic characteristics of the area. This Apennine sector is affected by 15 to 20-km-long active fault systems, consisting of minor fault-segments. Each of these fault-segments may be responsible for earthquakes characterised by magnitudes ranging between 5.5 and 6.0 (such as those occurred in 1599, 1730, 1838, 1859, 1979). However, the occurrence of one large-magnitude event (1703, Ms = 6.7) and of seismic sequences (1747–1751; 1997–1998) indicate that an entire fault system may be activated suddenly (at least in the southern part of the investigated area) or during seismic crises which may last many months. The comparison between the active faulting framework and the long-term seismicity also indicates that no significant earthquakes may be related to the Mt. Vettore Fault System since 1000 AD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009869105777
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal, structural and acidic characterization of some vanadyl phosphate materials modified with trivalent metal cations (1997)
    Springer
    Journal of thermal analysis and calorimetry 50 (1997), S. 355-364 
    Details
    ISSN: 1572-8943
    Keywords: 1-butene isomerization ; M3+-substituted vanadyl phosphates ; structural characterization ; thermal characterization ; vanadyl phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A set of new materials with general formula [M(H2O)]X(VO)1−XPO4·2H2O (M 3+=Al, Cr, Ga, Mn), isomorphous with layered tetragonal VOPO4·2H2O and having potential catalytic properties, have been characterized by TG and DTA, X-ray diffraction and surface acid strength. During heating the compounds transform in the monohydrated and anhydrous phases, all maintaining a layered structure, with a proper interlayer spacing. Catalytic tests performed with 1-butene show that theM 3+-vanadyl phosphates greatly improve the conversion of the olefine with respect to pure vanadyl phosphate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01980496
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